Circuit arrangement for controlling an oscillator in a colour te

Details Circuit arrangement for controlling an oscillator in a colour te Circuit arrangement for controlling an oscillator in a colour te

1987-01-02

1988-07-19

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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358 24, 358 25, H04N 945

Patent

active

047588799

ABSTRACT:
The invention relates to a circuit arrangement for controlling an oscillator. In a first phase-comparator circuit a burst signal whose phase alternates in a predetermined sequence is compared with a first oscillator signal. The output signal generated by the first phase comparator circuit is superimposed on a correction signal generated in a correction circuit, so as to eliminate fluctuations as a result of the phase alternation of the burst signal. The correction circuit is disabled when the magnitude of the phase difference exceeds a specific limit value.

REFERENCES:
patent: 4255759 (1981-03-01), Ohmori
patent: 4561014 (1985-12-01), Doyziech et al.

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